refactor: delete 7 dead component files

[jSydorowicz21]

Removes 7 component files with zero production imports and their 3 associated test files. Verified via grep that only references remaining are comments, type aliases, or self-references.

• AgentSessionsModal: superseded by AgentSessionsBrowser
• GitWorktreeSection: unreferenced worktree UI
• GroupChatParticipants: superseded by GroupChatRightPanel
• MergeProgressModal: superseded by TransferProgressModal
• ShortcutEditor: unreferenced shortcut editor
• SummarizeProgressModal: unreferenced progress modal
• ThemePicker: unreferenced theme picker

Lint passes clean. Targeted tests pass

Summary by CodeRabbit

Release Notes

• Tests

  • Removed test suites for shortcut editor, theme picker, and agent session management components

• Removed Components

  • Removed UI components for agent session management, shortcut editing, theme selection, git worktree configuration, group chat participants, merge progress tracking, and summarization features

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